Suricata

We don't have a similar option. How are the mac addresses logged with -e in Snort?

In NFQ mode, we don't have MAC address, because it is layer 3.

That's a feature request. Did anyone already looked into that? I did just test it with snort in sniffer mode (-vCd -i $DEVICE -e) which we don't have exactly, but could be useful in normal IDS mode as well.

At the team meeting in Amsterdam 2018 we agreed on the following:

for packets, log mac src/dst as a scalar field in eve
for flows, log mac src/dst as lists in eve
field names should be different to avoid type confusion (e.g. src_mac vs src_macs?)

Alerts will log based on packet, but can add mac addrs from flow too.

Just taking a look at this atm.

for packets, log mac src/dst as a scalar field in eve
for flows, log mac src/dst as lists in eve
field names should be different to avoid type confusion (e.g. src_mac vs src_macs?)

Alerts will log based on packet, but can add mac addrs from flow too.

I am wondering how to decide whether something is to be logged as flow or packet. Would it be enough to look at p->flow in CreateJSONHeader and see if the *pktcnt values there indicate >1 packet?

Also, am I correct in assuming that in order to log a list of MAC addresses, one would need to gather and update that during packet->flow assignment? Can you suggest a good suitable place to do that in the code? FlowHandlePacketUpdate?

Thanks!

Sascha Steinbiss wrote in #note-11:

Just taking a look at this atm.

for packets, log mac src/dst as a scalar field in eve
for flows, log mac src/dst as lists in eve
field names should be different to avoid type confusion (e.g. src_mac vs src_macs?)

Alerts will log based on packet, but can add mac addrs from flow too.

I am wondering how to decide whether something is to be logged as flow or packet. Would it be enough to look at p->flow in CreateJSONHeader and see if the *pktcnt values there indicate >1 packet?

Also, am I correct in assuming that in order to log a list of MAC addresses, one would need to gather and update that during packet->flow assignment? Can you suggest a good suitable place to do that in the code? FlowHandlePacketUpdate?

I think I've at least found a starting point: https://github.com/satta/suricata/commit/ac09ed3d3b85c76c0bb38795efcb0ab11466f67b